Smoke detector base



FIG. 1 is a perspective view of a smoke detector base showing my new design;

FIG. 2 is an enlarged front elevational view thereof;

FIG. 3 is an enlarged right side elevational view thereof, the left side elevational view being a mirror image of that shown;

FIG. 4 is an enlarged bottom plan view thereof; and

FIG. 5 is en enlarged top plan view thereof. 

The ornamental design for a smoke detector base, as shown and described. 